Posts by user "Old Boeing Driver" [Posts: 5 Total up-votes: 8 Pages: 1]

Old Boeing Driver
2025-06-12T16:40:00
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Post: 11899451
I agree

Originally Posted by oxenos
It is, in fact, possible to take off with insufficient power to fly. Sounds daft, but even with a low power setting, the aircraft will accelerate on the runway, since there is only profile drag to overcome. Then, having used an awful lot of runway, it achieves just enough speed to be hauled off the ground. At this point, you add induced drag to profile drag, and at the necessarily high angle of attack there would be an enormous amount of induced drag. The aircraft is now airborne, but on the wrong side of the drag curve.

In 45 years of flying I have never seen this done with a full sized aircraft ( thankfully ), but I have seen it happen with a model aircraft. Owner could not understand how it could take off but not fly.
I know it seems improbable in this case, but it does fit the facts.
Airborne right at the end of TORA, no apparent engine failure/yaw, but a decaying airspeed and increasing sink rate.
It appears to me they were in ground effect until the end of the runway and the momentum gave them some climb. Then the low thrust and high drag took over.

Last edited by Old Boeing Driver; 12th Jun 2025 at 16:43 . Reason: Spelling

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Old Boeing Driver
2025-06-12T16:56:00
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Post: 11899468
Rough Estimate

Originally Posted by hitchens97
Why are people saying full fuel load? The route is nowhere near close to maximum range for a 787, even taking off at a hot airport. And it's not like they need a lot of spare given there are a gazillion alternative airports near LGW if they need to divert.
Depending on temps, the B787-800 holds about 221,000 pounds of fuel, and this flight probably required about 120,000 pounds including alternate requirements. Rough estimate.

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Old Boeing Driver
2025-06-12T16:59:00
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Post: 11899474
Originally Posted by Quantz
Not in Paris region. Habsheim, in Alsace. An air show, you're correct. With the brand new A320.
Air France 296Q

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Old Boeing Driver
2025-06-12T19:33:00
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Post: 11899653
Originally Posted by Obba
Condolences to all the people who have lost loved ones:

I have a question about that: As the plane would have been fully fueled (say 50t), a full flight and full luggage etc - and if it didn't have enough speed for - say no flaps, short takeoff, pulled up before V1 - and assuming both engines were 'ok':

Aren't aircraft nowadays require only one engine for a takeoff in an emergency (one assumes that would be a in fully loaded configuration)...?

If so, then surely two fully good engines should have no problem, particularly when it's taken off already...?
Fully fueled would be a bit over 100T

Subjects: Condolences  V1

Old Boeing Driver
2025-06-13T23:28:00
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Post: 11900998
Everyone here should read post #867

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